Square Footage Calculator

Calculate area for rectangles, circles, triangles, and trapezoids with unit conversions

Choose Shape

Rectangle

Area Results

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Enter dimensions to calculate

Choose a shape and enter dimensions above

How to Use the Area Calculator

Calculate area for any shape with unit conversion

1

Select Shape

Choose from rectangle, circle, triangle, or trapezoid

2

Enter Dimensions

Input the measurements of your shape in feet or metres

3

Get Results

See the area in both square feet and square metres instantly

4

Convert Units

Switch between square feet and square metres with one click

Area Calculator FAQ

How do you calculate square footage of a rectangle?

To calculate the square footage of a rectangle, multiply the length by the width. For example, a room that is 12 feet long and 10 feet wide has an area of 120 square feet (12 x 10 = 120). Make sure both measurements are in the same unit before multiplying.

How do you calculate the area of a circle in square feet?

To calculate the area of a circle, use the formula: Area = Pi x Radius^2 (approximately 3.14159 x Radius x Radius). For example, a circle with a radius of 5 feet has an area of about 78.54 square feet. If you have the diameter instead, divide it by 2 to get the radius first.

How do you convert square feet to square metres?

To convert square feet to square metres, multiply the area in square feet by 0.092903. Conversely, to convert square metres to square feet, multiply by 10.7639. For example, 100 square feet equals approximately 9.29 square metres (100 x 0.092903 = 9.29).

How do you calculate square footage of a triangle?

To calculate the area of a triangle, use the formula: Area = (Base x Height) / 2. The base and height must be perpendicular to each other. For example, a triangle with a base of 10 feet and a height of 8 feet has an area of 40 square feet ((10 x 8) / 2 = 40).

How do you calculate the area of a trapezoid?

To calculate the area of a trapezoid, use the formula: Area = ((Base 1 + Base 2) x Height) / 2. Add the lengths of the two parallel sides (bases), multiply by the perpendicular height, then divide by 2. For example, with bases of 6 ft and 10 ft and a height of 5 ft: ((6 + 10) x 5) / 2 = 40 sq ft.